| Re: [GMCnet] safe hot water tank temperature??. [message #172787] |
Sun, 10 June 2012 11:09 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Armand,
I just stumbled on to the Atwood 6 gallon water heater manual:
http://www.atwoodmobile.com/manuals/waterheaters/MPD%2093757%20PS%2011.19.07
.pdf
There's a wiring diagram that shows the two switches. Note that the temp
control switch is set to 140° F. I couldn't find the over temp switch
setting but I run a 180° thermostat and I'll bet the water temp in the water
heater gets that high and that's why it trips!
Regards,
Rob M.
-----Original Message-----
From: Robert Mueller [mailto:robmueller@iinet.net.au]
Armand,
I think we may be comparing apples and oranges!
Is this the water heater you have in your GMC?
http://www.appliedgmc.com/prod.itml/icOid/518
Or is it this one:
http://www.appliedgmc.com/products/full/886.jpg
This second one looks like the one in Double Trouble. If you remove the
cover on the front I believe you will find there are two switches:
1) Water temp control switch - non adjustable - wish it was!
2) Water temp overheat switch - it has a little red button in the middle to
reset it.
Even though there is a restrictor in the fitting that screws into the intake
manifold that feeds the engine cooling water to the water heater the water
over temp switch trips and the temperature relief valve spews water out as I
noted in my earlier messages.
If your water heater does not have a water over temp switch that trips and
shuts off power to the element while you drive down the road and the
temperature relief valve doesn’t spew hot water out of it when you hook up
city water or run the pump then it doesn’t matter.
As I've said a couple of times already your idea is a great solution to keep
from scalding yourself with overly hot water.
Regards,
Rob M.
-----Original Message-----
From: Armand Minnie
Rob, I use the forum so no problem getting your messages. My coach has the
standard electric water heater (new SS one from Jimk) with the engine
preheat. There is no overheat shutoff. My old water heater used to get so
hot when plugged in (because some PO installed the thermostat so it was not
in contact with the tank) that the pressure relief valve would constantly
drip.
I never measured the temperature of the preheated water vs. the electrically
heated water but they were both pretty hot. I assume that the preheat water
temp in the new tank is the same as the old tank and that it pretty close to
engine operating temp (190 - 200 degrees) when I stop. With my plumbing mod,
the water coming out of the tap with either heat source is the same so I
assume that the electrically heated water is also in that temp range.
So, what does it matter if it is close to the engine coolant temp as long as
it doesn't come out of the tap at that temp?
--
Armand
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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